Proxmox USB device at VM

 

Login to console of mail Proxmox hypervisor

run the command: lsusb and collect USB device ID

root@proxmox:~# lsusb

if we wants to attach this usb  (usb-device-id 8564:7000) to vm id 145 

first stop VM 145 and run below command

root@proxmox:~# qm set 145 -usb0 host=8564:7000

Now start VM ID-145 and check the device with lsblk

# lsblk or fdisk -l 

to find acutal device with partition and finally mount with mount command # mount /dev/sdx1 /mnt

Iredmail password change md5 ssha512

 To generate a password hash for a new password, please use doveadm command.

Generate a SSHA512 password hash:

$ doveadm pw -s 'ssha512' -p '123456'

{SSHA512}jOcGSlKEz95VeuLGecbL0MwJKy0yWY9foj6UlUVfZ2O2SNkEExU3n42YJLXDbLnu3ghnIRBkwDMsM31q7OI0jY5B/5E=

Generate a BCRYPT password hash on BSD system:

$ doveadm pw -s 'blf-crypt' -p '123'

{BLF-CRYPT}$2a$05$9CTW6FZtjHeK6W.2YMmzOeAj2YFvDpP4JEH0uH/YLQI81jPWDtzQW

SQL backends

To reset password for user user@domain.ltd, please login to SQL server as either SQL root user or vmailadmin user (note: sql user vmail has read-only privilege to vmail database, so you cannot use it to change user password), then execute SQL commands to reset password:

sql> USE vmail;

sql> UPDATE mailbox SET password = '{SSHA512}$1$KxfQLbMV$Pq3x21nQEYMm6eFUrVJOS.' WHERE username = 'tayab.khan@toron.com.bd';

Fail2Ban jail search and unban

 

** To see / get the actual jail names

#fail2ban-client status | grep "Jail list" | sed -E 's/^[^:]+:[ \t]+//' | sed 's/,//g' 

example output:: ssh-iredmail roundcube-iredmail postfix-iredmail dovecot-iredmail pam-generic ssh-iptables

** To Unban IP use bellow command

#fail2ban-client set JAIL_NAME unbanip 1.2.3.4

fail2ban-client set ssh-iredmail unbanip 1.2.3.4

fail2ban-client set roundcube-iredmail unbanip 1.2.3.4

fail2ban-client set postfix-iredmail unbanip 1.2.3.4

fail2ban-client set dovecot-iredmail unbanip 1.2.3.4

fail2ban-client set ssh-iptables unbanip 1.2.3.4

fail2ban-client set pam-generic unbanip 1.2.3.4

Clear Memory / RAM cache in Linux

 

How to Clear Cache in Linux?

Every Linux System has three options to clear cache without interrupting any processes or services.

1. Clear PageCache only.

# sync; echo 1 > /proc/sys/vm/drop_caches

2. Clear dentries and inodes.

# sync; echo 2 > /proc/sys/vm/drop_caches

3. Clear pagecache, dentries, and inodes.

# sync; echo 3 > /proc/sys/vm/drop_caches 

Format your Pen drive / USB Flash Drive from Command Prompt

How to  

Step 1: Type cmd in the search box, then you can get the best match called Command Prompt. Right-click on it and choose "Run as administrator".

Step 2: On the Command Prompt window, type diskpart and press "Enter".

Step 3: Type list disk and press "Enter". According to the list disk information, check which disk is your USB flash drive. For example, disk 2.

Step 4: Now type select disk 2 and press "Enter".

Step 5: Type clean. Wait some time for disk erasing.

Step 6: Type create partition primary and press "Enter".

Step 7: After diskpart successfully created the specified partition, type format fs=ntfs and press "Enter". If you prefer other file system formats, change the command ntfs to the desired one such as fat32, exfat, etc.

Step 8: Type assign to create a drive letter to the flash drive.

Outlook Sync send / recieve issue

 

Please follow the attached steps to overcome the slow sync issue from Laptop/Desktop.